Do we know who made the transformers originally? I maintain some old industrial hardware designs that used pulse transformers from the mid-60's and I may still have catalogs and/or data sheets.
-chuck On Thu, Apr 13, 2017 at 7:01 PM, Pete Lancashire via cctalk <cctalk@classiccmp.org> wrote: > Using a t-2052 build up a test fixture, a pulse generator and a > oscilloscope and if have access to one a high bandwidth current probe. Use > the 2052s you have, record the curves etc and then make up some test > transformers. > > -Pete component engineer in a former life. > > On Apr 13, 2017 3:36 PM, "Vincent Slyngstad via cctalk" < > cctalk@classiccmp.org> wrote: > >> I realize it's a long shot, but does anyone have: >>> >> >> - Any spare T-2052s (or know of a source) >>> - Any idea what the T-2052 *was* so I can try to replace them. I haven't >>> found much detail as of yet. >>> >> >> Good news on this front! >> >> I had previously obtained a data sheet for the T2037, a similar >> transformer. >> >> I extracted 4 each T2037 and T2052 from a broken G228, and today I was >> able to get measurements off of them: >> >> T2037: >> A: 230uH, 170 mohm primary, 42.9uH 100 mohm secondary >> B: 220/170, 41.6/100 >> C: 232/170, 43.8/60 >> D: 231/170, 43/80 >> >> These are consistent with 16 turns and 7 turns of #33 wire, wound on an >> FT37-77 toroid per the instructions on the data sheet, and also with the >> 220 uH /43 uH 20% specs that appear there. >> >> Here are the T2052 measurements: >> A: 597/320, 597/320 >> B: 530/270, 530/270 >> C: 34/1040, 24/680 >> D: 551/280, 551/280 >> >> Ignoring "C", which is quite likely broken in some way, these are >> consistent with a 25 turn 1:1 transformer. I'm not sure what they are >> wound with, as #33 wire should give a lower DC resistance. >> (#34 is closer. It's also possible that they changed cores, but I suspect >> that they are also wound on FT37-77 cores.) >> >> It's possible that a fairly standard modern 1:1 pulse transformer could be >> substituted. The 78615/2JC, for instance is 500uH, 1:1 if you ignore the >> center tap pins. >> >> Vince >>